The most secure joomla version is every time the latest version that s why we must update every time when there is a new version releases. The same things exist and for third party extensions. Now about info you can check https://www.joomla.org/announcements.html

@ribo No, you do not understand! I do not need support!
All my Joomla sites are updated to 3.4.6, thank you.

My intention is to help the Joomla project by discussing the content of this website:http://joomlacode.org/gf/project/joomla/frs/ since it is linked all over the world in many posts etc. and might need some changes or be taken care of in other ways.